<?php
/************************************************************************
 * This file is part of EspoCRM.
 *
 * EspoCRM - Open Source CRM application.
 * Copyright (C) 2014-2021 Yurii Kuznietsov, Taras Machyshyn, Oleksii Avramenko
 * Website: https://www.espocrm.com
 *
 * EspoCRM is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * EspoCRM is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with EspoCRM. If not, see http://www.gnu.org/licenses/.
 *
 * The interactive user interfaces in modified source and object code versions
 * of this program must display Appropriate Legal Notices, as required under
 * Section 5 of the GNU General Public License version 3.
 *
 * In accordance with Section 7(b) of the GNU General Public License version 3,
 * these Appropriate Legal Notices must retain the display of the "EspoCRM" word.
 ************************************************************************/

namespace Espo\Core\Currency;

use Espo\Core\{
    ORM\EntityManager,
    Utils\Config,
};

/**
 * Populates currency rates into database.
 */
class DatabasePopulator
{
    private $config;
    private $entityManager;

    public function __construct(Config $config, EntityManager $entityManager)
    {
        $this->config = $config;
        $this->entityManager = $entityManager;
    }

    public function process()
    {
        $defaultCurrency = $this->config->get('defaultCurrency');

        $baseCurrency = $this->config->get('baseCurrency');
        $currencyRates = $this->config->get('currencyRates');

        if ($defaultCurrency !== $baseCurrency) {
            $currencyRates = $this->exchangeRates($baseCurrency, $defaultCurrency, $currencyRates);
        }

        $currencyRates[$defaultCurrency] = 1.00;

        $delete = $this->entityManager->getQueryBuilder()
            ->delete()
            ->from('Currency')
            ->build();

        $this->entityManager->getQueryExecutor()->execute($delete);

        foreach ($currencyRates as $currencyName => $rate) {
            $this->entityManager->createEntity('Currency', [
                'id' => $currencyName,
                'rate' => $rate,
            ]);
        }
    }

    protected function exchangeRates(string $baseCurrency, string $defaultCurrency, array $currencyRates) : array
    {
        $precision = 5;
        $defaultCurrencyRate = round(1 / $currencyRates[$defaultCurrency], $precision);

        $exchangedRates = [];
        $exchangedRates[$baseCurrency] = $defaultCurrencyRate;

        unset($currencyRates[$baseCurrency], $currencyRates[$defaultCurrency]);

        foreach ($currencyRates as $currencyName => $rate) {
            $exchangedRates[$currencyName] = round($rate * $defaultCurrencyRate, $precision);
        }

        return $exchangedRates;
    }
}
